支持Node.js环境，发布到NPM仓库

index.js

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+const {Solar, Lunar, SolarWeek, SolarMonth, SolarSeason, SolarHalfYear, SolarUtil, LunarUtil, HolidayUtil} = require('./lunar.js')
+
+module.exports = {
+  Solar: Solar,
+  Lunar: Lunar,
+  SolarWeek: SolarWeek,
+  SolarMonth: SolarMonth,
+  SolarSeason: SolarSeason,
+  SolarHalfYear: SolarHalfYear,
+  SolarUtil: SolarUtil,
+  LunarUtil: LunarUtil,
+  HolidayUtil: HolidayUtil
+}